Improvement in rolls for rolling metals



` Buchanan, in thecounty I chine, and Fig. 2 through the rolls.

vgreater than line, causes the metal them .to be 'stretched out.

AIT-ED` STATES PATENT A ()Fiu-'CE-t,

BERNARD LAUTH, 'or BUCHANAN, PENNSYLVANIA:

iMPRoveMENT IN' Ro Lus "Fon RoLiiNcM-ETALS.,

4 Specification forming part of Letters Patent No. 41,307, dated January- A19,- l664,

To all whom it may concern:

Be it known that I, BRNARD LAUTH, of

of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in 'Machinery for Stretching Plates, Hoops, Sheet-Iron, &c.;

v and I do hereby declare that the following is a full, clear, and exact descriptionI of the same, reference being had to the accompanying drawlngs, making a part4 of -this specification, in

which- Figure 1 represents a front view of the nia; a vertical transverse section The nature of my invention consists in an apparatus or machinery for stretching plates, hoops, sheets, &c., of iron or other metal,

composed of threelhigh rolls, the center one of which is of less diameter than the upper and lower one. The action of these rollsviz., thelesser one-wit l`1'the greater onefin result is somewhat like that of drawing out metalupon an anvilwthahammer, but without the rindentations, thusleaving smooth surfaces uponj the metal, the larger roll having greater bearing-surface, and the pinching-line of the smaller roll serving t'o stretch out the i metal passing between them.' 'Ihe difference tween the greater bearing-surface and the `lesser acting-surface of the smaller roll, which,

theoretically, Yis but a line," but practically' is between To enable others skilled. in the'art to make and use my invention, I will proceed to describe the same with reference to thedrawings.

Arepresent three rolls set in a housing, D, whlch may havethe usual appliances of bearing-blocks', followers, and screws for properlyadj usting them to the-housing and to each other. The center'roll, B,.-is of much less diameter' than the over and underlying ones,

A 0,'which are made substantial enough to resist the strain or spring incident to the pressure of the piece passed through between them; .Suppose the' passes to be made between -B C, then, in this case, lthe upper roll, A, receives the strain or spring o f thelesser one, B, which, without the upper one to sustain it, would spring away from the work and defeat its ob ject and purpose. So, too, if the metal .be passed between A and B,'.then the lower roll takes thelstrain o' from the lesser,one,B,which otherwise would spring, and thus, though aother large roll to take the'strainof the smaller -one-upon itself the stretching could not be done.`

performs.

' The diameter of the center rollof the set, 'or i three, must be much less than that of the outer rolls of the series, but its surface-speed must be the same as' that of the larger rolls, otherwise the thin plates or she'ets passedbetween..

them would wind up orbe torn asunder.

In this machine the poweris applied to but one Vof 'the' series of `rolls-one of the large rolls-the smaller ones, whether one or more, running by fiiction only. vI have shown the journal of the under roll as arranged for beingdriven by gearing, lwhilethe others run by friction only, though the outside rolls may be geared together, -but must have uniform surfacespeed. By such an arrangement the'rolls',

need not be set down so close upon-each other which'causes them to wear into grooves or' uneven surfaces; and I. find in practice that the small rolls between the greater ones wear down to smooth polished surfaces, and obviate thenecessity of so much turning down, as by' 'the plans heretofore pursued for this purpose.

In one pass through between'therolls asV 'arranged by me the plates, hoops, sheets, or

other iron or ,steel plate or bla'nk can be 1;e' duced as much as by several passes through,- rolls as heretofore arranged and used. I have` called this arrangement. three-high ro1ls;

'but do not restrictthe invention to that num-v -ber, as'two or more small rolls may be used, b'ut;

I cannot useless than three. There must be two'larg'e outer rolls to take the strain upon, and between these 'there may be one or more small rolls, as the stretching lcannot be soeffectually and rapidly done by large rolls as by .the small rollsl acting against the surface of a large one. or -in concert'with a large roll,.and^I get a more perfect and uniformly-smooth surface on both'sides of the metal plate, sheet, 86e.

than by any other system of rolling heretofore employed, M

The three-high rolls are therefore necessary, though the third one is or may be saldto be passive rather than active in the duty it If the metall to rolled-is passed only bespring of thesmall rolls, theuniformly-smootu -tween the rolls B and C, then the roll A must surfaces and thickness could notbe attained.

be set 'down close to the roll B. If, however, What I claim as my invention istwo sheets, plates, or other articles are run The combination of the three-high rolls, A

"through at the same time, one above and the B C, of whichone; B, shall be of less diameter other below the small roll B, then the top roll than the other, substantially as and for the must be eased up accordingly, to give the purpose herein described and represented. gaged thickness to the articles to be stretched. BERNARD LAUTH. Itis the knifeedged" bearing of the small Witnesses: u v rolls against the broader surface of the larger JOHN STEvENsoN,

vrolls that stretches orl draws out the metal; but DANIEL BERG,

without the larger rolls to take the' strain or O. B. STEVEIISON.e 

